Sleep Soundly Speaker Systems is a baby crib mattress with embedded, rechargeable, bluetooth speakers that fits comfortably into most cribs. While combining technology with the highest safety standards, sounds used for babies to fall asleep will help your infant and/or toddler fall asleep quicker and stay asleep longer. The speakers will connect to the phone of parent/guardians which allow the parents to chose the volume and what noises the baby falls asleep to, as each sound is different depending on the infant.